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In a poll run by Express.co.uk. 38 per cent of readers believe Iain would exit, while 32 per cent insist he will stay as he won't want to leave his co-workers behind.

Some also suggest he could simply take a break from work, to mourn the loss of Sam.

In upcoming episodes, viewers will see Iain, Jan Jenning (Di Botcher), and Ruby Sparks (Maddy Hill) struggling to come to terms with the loss of Sam, but things are set to get worse for the team.

The show’s producer recently revealed there will be more hard-hitting storylines to grace screens, with this year set to be “the year of the paramedic”.

Speaking to Digital Spy, Lucy explained: “It's about our paramedic family as they all struggle to come to terms with what's happened and deal with Sam's death at the same time as having to deal with the pressure of a front-line job.

“There is an epidemic of mental health issues in paramedics currently. Given that they are first on the scene of some quite horrific situations, it's not surprising that it takes its toll.”

And Sam’s death will take a particular toll on Iain, as he is due to take on a “dark journey”.

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Lucy discussed his upcoming turmoil and explained how Iain will really struggle to deal with the loss.

“Iain in particular will find it very difficult,” she began. “He finds for the first time in his life that he can't just lock his emotions away in a box and be the smiling, happy go-lucky chap that we know so well.

“This time, it is all the more overwhelming, all the more challenging and he really struggles to cope.”

It comes after Iain and Sam were sent to help two young women out of their car after they crashed into the side of a petrol container.

The team managed to get the women to safety just as the tank blew up and unfortunately Sam was struck with the aftermath effects.

Casualty spoilers: more tragic scenes to come in the drama (Image: BBC)

She was seen being thrown against the side of the ambulance, and whilst she appeared to be okay, it was revealed she had shrapnel lodged in her side and later died in the arms of her colleague Iain.

Following the episode, a trailer for the new series was posted on the show's official Twitter account and hinted at more tragedy to come.

Iain could be seen standing over Sam's body as she lay in the morgue and apologised for not being able to save her.

He could be heard saying: “I’m sorry Sam. This is all my fault.”

Did Iain do something that put Sam’s life at risk? What will the official investigation into Sam’s death reveal?